Abstract

PAIAO, J. R. B.; PEREIRA, F.  and  WATANABE, S.. Soda-lime glass with gradient of refraction index (GRIN). Braz. J. Phys. [online]. 2001, vol.31, n.1, pp. 77-79. ISSN 0103-9733.  http://dx.doi.org/10.1590/S0103-97332001000100014.

In a soda-lime glass provided by Companhia Vidraria Santa Marina, subsidiary of French Saint-Gobain, we induced a gradient of refraction of index (GRIN) by exchange of Na⁺ in glass by Li⁺ at 550^oC for 12, 24, 36 and 48 hours and varying bath temperature at 525^oC, 550^oC, 575^oC and 600^oC for fixed time of 48 hours. Dn = 0.0107 ± 0.0005 and GRIN depth of about 2.4mm were obtained for the ion exchange at 550^oC for 48 hours. The GRIN profile was fitted with er fc(x) function and then obtained the diffusion coefficient D = (1.6 ± 0.3) · 10^-6 mm²/s.